After the success of ShaderX, the ShaderX2 books and ShaderX3, we are looking for authors for ShaderX4. The book will cover advanced rendering techniques that run on the DirectX and OpenGL run-time with any shader language available. It will include topics on: Geometry Manipulation; Rendering Techniques; Software Shaders and Shader Programming Tips; Image Space; Shadows; 3D Engine Design; Tools; Environmental Effects. Proposals are due by February 28th, 2005. Check out www.ShaderX4.com for the schedule and contact Wolf at shaderx.com for further questions, remarks and suggestions.